Exhaust muffler



April 16, 1929. F F, HAMlLTON 1,709,217

EXHAUST MUFFLER Filed March l5, 1928 INVEH TOR, F "04.0 'Hami H'on,

dmvw, Attorneye.

Patented Apr. 16, 1929.

UNrrEo s'rAIssA FRANCIS r. HAMILTON, or INDIANAPOLIS, INDIANA.

nxnAUsr Murrnnn.

y Application filed March 15 This invention relates to a muffler of the type adapted to receive `the exhaust gases from hydrocarbon engines of the type commonly employed in automobiles and the like, andhas for its purpose the reduction or elimination of the back pressure created by the heretofore commonly used Inufllers, at the same timepermitting a noiseless escape of the gases.

I By means of this invention, the gases travel through my muffler in a continuous direction without being reversed, the gases being first spread outto travel paths of unequal lengths into a large expansion chamber, the extent of travelling over longer distances of part of the gases being dependent entirely upon the rapidity of discharge of gases into the muffler, thence permitting i the gases to flow on through the mulder to be kbrought together again at the rear discharge end after having come through paths of unequal length.

The invention is described in one particular form in reference to the accompanying drawing, in which- Fig. 1 is a fragmentary top plan view of a inuliier embodying the invention;

Fig. 2, a vertical transversek section through the muffler on the line 2 2 in Fig. 1 Y

Fig. 3, a vertical transverse section on the line SW3 in Fig. 1; and

Fig. Il, an outer end elevation of a coney employed in each end of the muffler Lilie characters of reference indicate like parts throughout the several `views of the drawing.

I l form a housing 5 of greater length than width to have a cress-sectional periphery substantially as indicated in Figs. 2 and 3, though the particular shape may be varied fromY a circle to any polygonal shape (not shown) provided a certain feature is mains tained as will be indicated below.

In each end of tl e housing 5 li mount. a reflector G by means of the spacing fingers 7 which are welded to the housing 5 and hold the reflector 6 out of contact with the housing wall to have substantially a uniform opening entirely around therebetween save for the extension of the supporting fingers 7 thereacross. Each reflector 6 presents a concave face from the inner side of the housing directed one toward the other.

A partition 8 is fixed between the reflec- Serial No. 261,753.

tors `6, within and transversely of the housing, to the rear of the transverse center line of the housing to divide the housing into a large forward expansion chamber and a smaller rear expansion chamber. @ver to one .eXtreme side of the partition, a single orifice 9 is cut therethrough to permit gases to flowy from one chamber to the other.

lOn the outer sides of each of the reflectors 6 is secured a shell 10 formed to have a sharpl vertex extended from the reflector with the walls of the shell embodying straight line elements everywhere sloping outwardly from the vertex to the periphery of the reflector 6, the whole shell and reflector forming a. cone-like solid which while not a true cone, will hereinafter be termed a cone.

The vertex of each cone however is not central of the base or reflector 6, but lies on the longitudinal center line through the orilice 9.

A head 11 is secured to each end of the housing 5 to surround the 'protruding cones to define a continuous space entirely around and therebetween. Thek forward head 11 receives the exhaust pipe 12 centrally of the vertex of the cone and a plurality of posts 13, here shown as three in number are welded in place between the head 11 and the vertex end of the shell 10. Similarly the rear head 11 caries a discharge or tail pipe lll with its center line coinciding'with the center line of the cone vertices. V

Gases discharging from the exhaust pipe 12 strike the vertex of the cone and are distributed or differentiated to travel between the head l1 and they shell 10 toward the large expansion chamber. Obviously, as the vertex ofk the cone is not central of the reflector 6, some of the gases travel agreater dis-.

tance a from the end of the pipe 12 to the chamber than do gases going the shorter way F 1, so that for a given discharge from the pipe 12, there is a time interval before all of the discharge arrives in the expansion chamber.

The hole 9 permits the gases to move from the larger expansion chamber into the rear chamber, and from there the gases pass around the edgesI of the rear reflector 6 between the shell 10 and the head 11 where again the gases may travel varying distances before the tail pipe 14 is reached to permit escape of the gases into the atmosphere.

rlhe centers ot curvature ot the reflectors 6 are within the respective trent and rear expansion chambers.

As above indicated, the exact cross-sectional shape oi the housing iinn'iaterial. lt is essential that the center line ot the inuiier intake, the partition hole E) and the niu'tiler outlet be decidedly to one side of the longitudinal center line of the niuiiler expansion chambers.

ll/Thile l have herein described rny invention in the `torni now best known to me, it is obvious that structural variations may be introduced witl'iout departing;` troni the spirit ot' the invention, and l, therefore, do not desire to be limited to the precise structure as shown and described, nor any more than niay' be nccessitateifi by the ollowing claims.

t claim:

l. ln a inuilier et exhaust gases, a housing. a forward head on the housing, said head having an intake opening' to one side ot the central portion of. the head, a. dcllector having` its vertex just back ot said opening, a partition extended transversely across the housing to divide the housing into a torward and a rearward chaniiber, said partition having an openingtherethrough o'i'set considerably trein 'the center, a rear head on the housing having; `a discharge openingl therefrom, and a de'tlector having its vertex just ahead of the discharge opening, said discharge opening` being considera-bly to one side ot' the central longitudinal axis of the housing.

2. A inutiler housing' having an end enclosed by a head projecting outwardly there- 'troin and drawn in to a vertex considerably to one side ot the central axis ot the housing, and a body inilar in shape to and mounted in the end ot the housing to have its vertex iliointed toward 'but spaced back of said head vertex whereby there is av space entirely around the bod-y between it and the projected head, said hourliingr having' its opp( cud projected mitwardly tluuetroni aad drawn to a vertex considerably to onY side oit the axial center o'j the housing', a body similar in shape to and carried in the said opposite drawn end to have its vertex spaced just. back ot the end vertex whereby the body defines a space around and between it and the hiiusingv end communicating to within the housing, and a transverse partition in said housing deining two chambers therein, said partition havingan opening therethrough.

3. A inutiler housing` having,` an end enclosed by a head projecting outwardly therefrom and drawn in to a vertex considerably to one side oi the central axis ot the housing, and a bodysiinilar in shape to and mounted in the end et' the housing to have its vertex pointed toward but sp ced back o1 said head vertex whereby there .is a space entirely around the body betv.v n it and the projected head, said housing having; its opposite end projected outwardly therci'roin and drawn to a vertex considcrabllY to one side of the axial center ot the housing, a body similar in shape to and carried in the sait op posite drawn end to have its vertex spaced just bach oi the end vertex whereby the body delfines ay space around and between it and the lmusin'gl end cor-.nn uni ating to within the housing, each oit said two bodies having` a concave tace presented to within the housing. i

t fr inuiler housinohaving an end enclosed by a head jrejectingl outwardly theretroin and drawn `in to a vertex considerably to one slide ot the central axis oit the housing, and a boda' similar in shape to and inounted in the end ot tl e housing to have its vertex pointed toward but spaced back ot said head vertex .vhereby there is a space entirely around the body between it and the havii'ig its opprojected head, said housing posite end projected outaardly tlierc-tren'i and drawn to a vertex considerably to one side et the axial center of the housing. a body similar in shape to and a ried in the said opposite drawn end to have its vertex spaced. just back of the end ver whereby the bony defines space around and between it and the housing end coiniuunicaiiin to within the housing, each ot said two bodies having; a concave 'tace j'n'eseuted to within the housing, and a par cion acr'f` aid housing between said concave tacos havingr an opening; therethrough. 'i

lo testix'nony whereof affix my signature. 

